The German Bayern Munich won a marathon victory over Manchester United 4-3 at the Allianz Arena in the first round of the group stage in the Champions League. Bayern Munich struck twice in four minutes in the first half to set them on their way to a 4-3 victory over an embattled Manchester United on Wednesday and make a winning start in Champions League Group A. Goals from Leroy Sané and Serge Gnabry in the 28th and 32nd minutes put the hosts firmly in the driving seat with injury-hit United, who have now lost their last three matches, pulling a goal back in the 49th through Rasmus Hojlund's deflected effort.  Harry Kane's penalty, awarded for a handball by Christian Eriksen, restored Bayern's two-goal cushion four minutes later before the game ended with a flurry of late goals. Casemiro slotted in from close range in the 88th minute but Bayern substitute Mathys Tel scored once more in stoppage time before Casemiro headed in another for United with the last move of the game. Bayern Munich earned the first three points to lead Group A, while Manchester United remained without points. Bayern Munich and Manchester United are in Group A, which also includes Copenhagen of Denmark and Galatasaray of Turkey.